程序包 org.meteoinfo.projection.proj4j.datum

类 Datum

java.lang.Object

org.meteoinfo.projection.proj4j.datum.Datum

public class Datum
extends java.lang.Object

A class representing a geodetic datum.

A geodetic datum consists of a set of reference points on or in the Earth, and a reference Ellipsoid giving an approximation to the true shape of the geoid.

In order to transform between two geodetic points specified on different datums, it is necessary to transform between the two datums. There are various ways in which this datum conversion may be specified:

• A 3-parameter conversion
• A 7-parameter conversion
• A grid-shift conversion

In order to be able to transform between any two datums, the parameter-based transforms are provided as a transform to the common WGS84 datum. The WGS transforms of two arbitrary datum transforms can be concatenated to provide a transform between the two datums.

Notable datums in common use include NAD83 and WGS84.

字段概要

字段

修饰符和类型	字段	说明
static Datum	CARTHAGE
static double	ELLIPSOID_E2_TOLERANCE
static Datum	GGRS87
static Datum	HERMANNSKOGEL
static Datum	IRE65
static Datum	NAD27
static Datum	NAD83
static Datum	NZGD49
static Datum	OSEB36
static Datum	POTSDAM
static int	TYPE_3PARAM
static int	TYPE_7PARAM
static int	TYPE_GRIDSHIFT
static int	TYPE_UNKNOWN
static int	TYPE_WGS84
static Datum	WGS84

构造器概要

构造器

构造器	说明
Datum()
Datum(java.lang.String code, double[] transform, Ellipsoid ellipsoid, java.lang.String name)
Datum(java.lang.String code, double deltaX, double deltaY, double deltaZ, double rx, double ry, double rz, double mbf, Ellipsoid ellipsoid, java.lang.String name)
Datum(java.lang.String code, double deltaX, double deltaY, double deltaZ, Ellipsoid ellipsoid, java.lang.String name)
Datum(java.lang.String code, java.lang.String transformSpec, Ellipsoid ellipsoid, java.lang.String name)

方法概要

修饰符和类型	方法	说明
java.lang.String	getCode()
Ellipsoid	getEllipsoid()
java.lang.String	getName()
double[]	getTransformToWGS84()
int	getTransformType()
boolean	hasTransformToWGS84()
boolean	isEqual(Datum datum)	Tests if this is equal to another Datum.
void	readEsriString(java.lang.String esriString)	Read ESRI projection string
java.lang.String	toEsriString()	To Esri string of datum part
java.lang.String	toString()
void	transformFromGeocentricToWgs84(ProjCoordinate p)
void	transformToGeocentricFromWgs84(ProjCoordinate p)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

字段详细资料

TYPE_UNKNOWN

public static final int TYPE_UNKNOWN

另请参阅:

常量字段值

TYPE_WGS84

public static final int TYPE_WGS84

另请参阅:

常量字段值

TYPE_3PARAM

public static final int TYPE_3PARAM

另请参阅:

常量字段值

TYPE_7PARAM

public static final int TYPE_7PARAM

另请参阅:

常量字段值

TYPE_GRIDSHIFT

public static final int TYPE_GRIDSHIFT

另请参阅:

常量字段值

WGS84

public static final Datum WGS84

GGRS87

public static final Datum GGRS87

NAD83

public static final Datum NAD83

NAD27

public static final Datum NAD27

POTSDAM

public static final Datum POTSDAM

CARTHAGE

public static final Datum CARTHAGE

HERMANNSKOGEL

public static final Datum HERMANNSKOGEL

IRE65

public static final Datum IRE65

NZGD49

public static final Datum NZGD49

OSEB36

public static final Datum OSEB36

ELLIPSOID_E2_TOLERANCE

public static final double ELLIPSOID_E2_TOLERANCE

另请参阅:

常量字段值

构造器详细资料

Datum

public Datum()

Datum

public Datum(java.lang.String code,
             java.lang.String transformSpec,
             Ellipsoid ellipsoid,
             java.lang.String name)

Datum

public Datum(java.lang.String code,
             double deltaX,
             double deltaY,
             double deltaZ,
             Ellipsoid ellipsoid,
             java.lang.String name)

Datum

public Datum(java.lang.String code,
             double deltaX,
             double deltaY,
             double deltaZ,
             double rx,
             double ry,
             double rz,
             double mbf,
             Ellipsoid ellipsoid,
             java.lang.String name)

Datum

public Datum(java.lang.String code,
             double[] transform,
             Ellipsoid ellipsoid,
             java.lang.String name)

方法详细资料

getCode

public java.lang.String getCode()

getName

public java.lang.String getName()

toString

public java.lang.String toString()

覆盖:

toString 在类中 java.lang.Object

getEllipsoid

public Ellipsoid getEllipsoid()

getTransformToWGS84

public double[] getTransformToWGS84()

getTransformType

public int getTransformType()

hasTransformToWGS84

public boolean hasTransformToWGS84()

isEqual

public boolean isEqual(Datum datum)

Tests if this is equal to another Datum.

Datums are considered to be equal iff:

• their transforms are equal
• OR their ellipsoids are (approximately) equal

参数:

datum -

返回:

If is equal

transformFromGeocentricToWgs84

public void transformFromGeocentricToWgs84(ProjCoordinate p)

transformToGeocentricFromWgs84

public void transformToGeocentricFromWgs84(ProjCoordinate p)

readEsriString

public void readEsriString(java.lang.String esriString)

Read ESRI projection string

参数:

esriString - ESRI projection string

toEsriString

public java.lang.String toEsriString()

To Esri string of datum part

返回:

Esri string of datum part